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paul-lmipaul-lmi 

Preserving HTTP session state with successive callouts

I was wondering how we can leverage Apex to interact with a web service that requires session state (ie, cookies) to be preserved in order to issue further API calls.

 

I thought simply reusing the HTTP object would do this, but apparently not.  Here's what I have:

 

string endpoint = 'https://somesite.com/api';
string user = 'someuser';
string pwd = 'somepassword';

//set up the http object to be reused
http ohttp = new http();

//set up the first request
httprequest oReq1 = new httprequest();
oReq1.setendpoint(endpoint + 'login.aspx?user=' + user + '&pwd=' + pwd);
oReq1.setmethod('GET');

httpresponse loginresponse = ohttp.send(oReq1);

//set up the second request
httprequest oReq2 = new httprequest();
oReq2.setendpoint(endpoint + 'secondapicall.aspx');
oReq2.setmethod('GET');
 
//this one fails because the session state is not preserved from the first call
httprespons secondresponse = ohttp.send(oReq2); 
 

 
 


Best Answer chosen by Admin (Salesforce Developers) 
ryanhcaryanhca
I don't see a way to do this easily with the API itself, so you probably have to code it yourself.
 
You'll have to parse the response headers for the cookie data, save that, then send it back with the subsequent request(s).
 
The initial response header should include one or more of the following lines:
 
Set-Cookie: NAME=VALUE; expires=DATE; path=PATH; domain=DOMAIN_NAME
 
Later response headers will need to include the following to send it back:
 
Cookie: NAME1=VALUE1;NAME2=VALUE2
 
 
 
 


All Answers
ryanhcaryanhca
I don't see a way to do this easily with the API itself, so you probably have to code it yourself.
 
You'll have to parse the response headers for the cookie data, save that, then send it back with the subsequent request(s).
 
The initial response header should include one or more of the following lines:
 
Set-Cookie: NAME=VALUE; expires=DATE; path=PATH; domain=DOMAIN_NAME
 
Later response headers will need to include the following to send it back:
 
Cookie: NAME1=VALUE1;NAME2=VALUE2
 
 
 
 
This was selected as the best answer
SuperfellSuperfell
You'll have to read the set-cookies header from the response of the first call, and add the relevant cookies header to the request of the 2nd call.


paul-lmipaul-lmi
for anyone reading this after, it'd be something like this
 
httpresponse hres = http.send(hReq);
String cookie = hres.getHeader('Set-Cookie');
 
and then use
 
hReq2.setHeader('Cookie: ' + cookie);
 
in the next/subsequent request. 


Cristela HernandezCristela Hernandez
Thank you so much. You helped to fix my problem of consecutive requests to an external system.